Humans:Alexander Blackhawk - the protagonist, first as a boy and later as a detectiveGerald Blackhawk - Alex's fatherMimiteh or Mim - Alex's grandmotherDouglas Jackson - the killerAlice Morgan - works on MarsLeona Whitehead - Head of Labratory controlsMax Whitehead - Chief of AstronomicsLawrence Baker - ReporterMike Carone - Chief Civil Engineer, who is in charge of labor and supplies and Alice's boyfriendMajor Holbrook - Commander of the Mars Space station on Mars and the military within the station.Harold Pickens - a civilian, the Head structural engineer in SecurityPresident Barrett - current president of the USAGeoffrey Tilden- party organizerJaxon - Alex's partner on EarthCarlos Marcelli - Douglas's fatherAliens:Dobi - A PiathianNommi - Dobi’s mate, a PiathianPenda - a piathian and Dobi's and Nomni's offspringCaptain Bartu - Captain, piathian and overseer of the ahman basePetro Flor - Phirmian CaptainEmel - Alice’s contact on the Mi-ReeiaMeeia - Alice’s friend, perops, and rescuerPentabi - Third planet from Ahmantec’s sun